3*4

PRACTICAL ORGANIC CHEMISTRY

upon dimethylaniline in presence of zinc chloride, and subse-
quent oxidation of the product, may be interpreted on similiar
lines, and has already been referred to. (See notes on Prep. 59, p.
279).
xC6H5
l^""H\ CCH4N(CH3)2
••.°    HjC(iH4N(CH3)2
/C6H5
HC~-QH4N(CH3)2
\C(;H4N(C1L).2
Leukobase of
malachite green.
X:8IIfi
O  =   IIO.C~C(;II4N(CII,)o
/C6H5       -
HCf-Q;II4N(CH,)o"
\cfiii4N(cii;).>
P>ase of malachite
green.
The preparation of " crystal violet" from Michler's compound
and dimethylaniline in presence of POCL may be explained in a
similar fashion,
nr XC(;II4N(CII,)o	Xy-I4N(CIIs)o
UL\Q5II4N(CH,)o   =  IIO.C^CGH4N(CII,).,
+ HCGH4N(C'IL)2	\C(iH4N(CIL>)o
Base of crystal
violet.
The constitution of thehydrochlorides of malachite green and
crystal violet will appear as follows : —

C/C«II5
\r\CdlI4N(CIL), 	r/C,,H4N(CHs)2
^•cv.u.nich,), 	
C 	yv 	
x\
IIC/       ^CII                                PIC 	x Yn 	
IIC^        /Cll                              IIC 	\ /cn 	
\/ 	\/ 	
c 	c 	
N(CH3)2 	N(CH3)2 	
1 	1 	
Ci 	Cl 	
Malachite green.                                            Crystal violet. 	
preparation 104,
Phthalic Acid.    In the formation of phthallc acid by the
oxidation of naphthalene with sulphuric acid, the mercuric ^ul-